因式分解x平方-2xy+y平方-9=

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因式分解x平方-2xy+y平方-9=
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因式分解x平方-2xy+y平方-9=
因式分解x平方-2xy+y平方-9=

因式分解x平方-2xy+y平方-9=
x^2-2xy+y^2-9
=(x-y)^2-9
=(x-y+3)(x-y-3)

x平方-2xy+y平方-9
=(x平方-2xy+y平方)-9
=(X-Y)方-9
=(X-Y+3)(X-Y-3)

x^2-2xy+y^2-9
=(x^2-2xy+y^2)-9
=(x-y)^2-3^2
=[(x-y)+3][(x-y)-3]
=(x-y+3)(x-y-3)